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File:Twilight description full day.svg|thumb|300px|Dusk is the period of time at the end of evening twilight. '''Dusk''' is the darkest stage of twilight in the evening.''The Random House College Dictionary'', "dusk". Pre-dusk, during early to intermediate stages of twilight, there may be enough light in the sky under clear-sky conditions to read outdoors without artificial illumination, but at the end of Twilight#Civil twilight|civil twilight, when the earth rotates to a point at which the center of the sun is at 6° below the local horizon, artificial illumination is required to read outside.U.S. Naval Observatory. [ Rise, Set, and Twilight Definitions].
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